Studies in the Gospel of John by Horatius Bonar and published by Classics.
This book is a series of 31 studies in the John's Gospel which would be suitable for short talks or Bible classes.
Some of the titles in this book are:
* The Living Water - God's Free Gift
* Night with Jesus
* Jesus our Light
* The Great Attraction
* The Mighty Comforter
* Tribulation, Peace and Victory
* The Greater Sin